My car is ordered with the regular 17"s and I want to upgrade to the 18" FR500 replicas (10" outback and 9" upfront). Do I need to retune my ECU after putting these on? Or should I just get a sidewall height (aspect ratio, for you technical lads) that would make my wheels/tires package comperable to the stock 17"s height?
Also, on a somewhat related note: how much performance do you guys think I might loose by going with the bigger wheels and tires (due to the increasaed rotational intertia)? Are the FR500s that much heavier than stock?
Also, on a somewhat related note: how much performance do you guys think I might loose by going with the bigger wheels and tires (due to the increasaed rotational intertia)? Are the FR500s that much heavier than stock?